diff --git a/Services/Zencoder.php b/Services/Zencoder.php
index 6d453d7..d11a182 100644
--- a/Services/Zencoder.php
+++ b/Services/Zencoder.php
@@ -96,12 +96,16 @@ class Services_Zencoder extends Services_Zencoder_Base
     * @param string               $api_version  API version
     * @param string               $api_host     API host
     * @param bool                 $debug        Enable debug mode
+    * @param string               $ca_path      Path to a directory that holds multiple CA certificates
+    * @param string               $ca_file      Path to a file holding one or more certificates to verify the peer with
     */
     public function __construct(
         $api_key = NULL,
         $api_version = 'v2',
         $api_host = 'https://app.zencoder.com',
-        $debug = false
+        $debug = false,
+        $ca_path = NULL,
+        $ca_file = NULL
     )
     {
         // Check that library dependencies are met
@@ -114,13 +118,18 @@ public function __construct(
         if (!function_exists('curl_init')) {
             throw new Services_Zencoder_Exception('cURL extension must be enabled.');
         }
+
         $this->version = $api_version;
-        $this->http = new Services_Zencoder_Http(
-            $api_host,
-            array("curlopts" => array(
-                CURLOPT_USERAGENT => self::USER_AGENT
-                ), "api_key" => $api_key, "debug" => $debug)
-            );
+
+        $http_options = array("api_version" => $api_key, "debug" => $debug, "curlopts" => array(CURLOPT_USERAGENT => self::USER_AGENT));
+        if (isset($ca_path)) {
+          $http_options["curlopts"][CURLOPT_CAPATH] = realpath($ca_path);
+        }
+        if (isset($ca_file)) {
+          $http_options["curlopts"][CURLOPT_CAINFO] = realpath($ca_file);
+        }
+
+        $this->http = new Services_Zencoder_Http($api_host, $http_options);
         $this->accounts = new Services_Zencoder_Accounts($this);
         $this->inputs = new Services_Zencoder_Inputs($this);
         $this->jobs = new Services_Zencoder_Jobs($this);